<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download"/>
          <a :href="templatePath">点击下载模版</a>
        </el-tag>

      </el-form-item>

<!-- :limit="1"  限制每次只能提交一个文件    -->
      <el-form-item label="选择Excel">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :action="updatePath"
          :on-change="overwriteFile"
          name="file"
          accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel">
          <el-button slot="trigger" size="small" type="primary" @click="selectUploadFile">选取文件</el-button>
          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            :disabled="importBtnDisabled"
            @click="submitUpload">{{ fileUploadBtnText }}
          </el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import PanThumb from "@/components/PanThumb";
import ImageCropper from "@/components/ImageCropper";

export default {
  name: "save",
  components: {PanThumb, ImageCropper},
  data() {
    return {
      BASE_API: process.env.BASE_API, // 接口API地址
      OSS_PATH: process.env.OSS_PATH, // 阿里云OSS地址
      fileUploadBtnText: '上传到服务器', // 按钮文字
      importBtnDisabled: false, // 按钮是否禁用,
      loading: false,
    }
  },
  computed: {
    //模板地址
    templatePath() {
      //return this.OSS_PATH + '/excel/%E8%AF%BE%E7%A8%8B%E5%88%86%E7%B1%BB%E5%88%97%E8%A1%A8%E6%A8%A1%E6%9D%BF.xls';
      return '/static/课程分类列表模板.xlsx';
    },
    //上传的接口地址
    updatePath() {
      //return this.OSS_PATH + '/excel/%E8%AF%BE%E7%A8%8B%E5%88%86%E7%B1%BB%E5%88%97%E8%A1%A8%E6%A8%A1%E6%9D%BF.xls';
      return this.BASE_API + '/eduService/subject/addSubjectByUploadExcel';
    },
  },
  created() {
    /*this.init();*/
  },
  watch: {
    $route(to, from) {
      /*this.init();*/
    }
  },
  methods: {
    //页面初始化方法，根据路径判断是添加还是更新
    init() {
      const userId = this.$route.params.id;
      if (userId) {
        this.getTeacherInfo(userId);
      } else {
        this.initData();
      }
    },
    //初始化data;
    initData() {
      Object.assign(this.$data, this.$options.data());
    },
    //上传服务器按钮点击事件
    submitUpload() {
      this.fileUploadBtnText = '正在上传'
      this.importBtnDisabled = true
      this.loading = true
      this.$refs.upload.submit()
    },
    //上传成功后执行该方法
    fileUploadSuccess(res) {
      if (res.success === true) {
        this.fileUploadBtnText = '导入课程分类成功'
        this.loading = false
        this.$message({
          type: 'success',
          message: res.message
        });
        this.$router.push("/subject/index")
      }
    },
    //上传失败后执行该方法
    fileUploadError(res) {
      this.fileUploadBtnText = '导入课程分类失败'
      this.loading = false
      this.$message({
        type: 'error',
        message: '导入失败'
      })
    },
    //应该再次选择文件时，再次选择的文件覆盖原来选中的文件
    overwriteFile(file,fileList){
      if (fileList.length > 1) {
        fileList.splice(0, 1);
      }
    },
    selectUploadFile(){
      if (this.importBtnDisabled){
        //TODO 询问用户是否再次上传
        this.$message({
          type: 'error',
          message: '您已提交成功，如果想再次上传请刷新页面'
        })
      }
    },

  }

}
</script>

<style scoped>

</style>
